Mobile Mine Maintenance Supervisor Jobs (NOW HIRING)

Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We’re reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision‑making.

The Mine Maintenance Supervisor is a safety-focused leader responsible for overseeing a team of technicians and ensuring the efficient operation of mine equipment. This role requires strong technical and problem-solving skills to diagnose and repair equipment, as well as excellent communication and organizational abilities to manage work orders, parts, and projects. The Mine Maintenance Supervisor will foster a positive work environment, prioritize safety, and collaborate effectively with other departments to maximize productivity and minimize downtime.

Housing can be provided onsite.

• Conduct daily safety meetings and workplace inspections to ensure a safe work environment.
• Manage and maintain technician daily logs, incident/accident reports, and investigation documentation.
• Ensure compliance with all relevant safety regulations and company policies.

• Complete timecards for crew in an accurate and timely manner.
• Supervise and lead a team of maintenance technicians.
• Assign tasks and prioritize workload to ensure efficient completion of maintenance activities.
• Foster a positive and collaborative team environment.
• Provide guidance, mentorship, and training to develop technician skills and knowledge.
• Promote and maintain a clean, organized, and safe work area.

• Effectively manage time and resources to meet deadlines and production targets.
• Prioritize maintenance tasks based on urgency and impact on operations.
• Plan and organize projects, including coordinating tooling, parts, and personnel.

• Create, review, and complete work orders accurately and efficiently.
• Communicate effectively with planners to ensure proper scheduling and resource allocation.

• Create, review, and manage parts lists for maintenance activities.
• Communicate with vendors to source and procure necessary parts.
• Research and identify suitable replacement parts and gather technical information.

• Perform hands‑on, in‑the‑field repairs and troubleshooting alongside the maintenance team as needed to support operational needs.
• Research technical information and parts requirements for repairs.
• Advise planners on necessary repairs and estimated downtime.
• Manage equipment availability and reporting to optimize operational efficiency.
• Collaborate with other departments to ensure timely and effective equipment repair.

• Experience managing a team in mobile or vehicle maintenance, preferably in a mine setting.
• Exceptional communication, interpersonal, and coordination skills are essential for success in this role.
• Proficient in Microsoft Office Suite, especially Excel and Outlook.
• The ideal candidate will possess proficiency in various welding techniques and demonstrate safe handling of related equipment.
• A comprehensive understanding of vehicle systems, including hydraulics, electrical, filtration, fuel, A/C and refrigeration, is crucial, along with the ability to troubleshoot, repair, and perform preventative maintenance on them.
• Ability to perform advanced troubleshooting and failure analysis, utilizing electronic diagnostic tools and interpreting maintenance manuals and schematics.
• Knowledge and skill in maintaining various pumps, compressors, boilers, and other plant equipment.
• The ability to work rotating shifts is necessary, with the understanding that the shift schedule may change as needed.
• Be willing and able to perform manual labor tasks as required.
• Be proficient in the use of maintenance tracking software.
• Be able to read and understand Material Safety Data Sheets (MSDS).
• Possess a valid driver's license.
• Must be able to work extended hours, overtime, and be available for on‑call status.

Everyone Gets Home Safe. We never put speed or cost ahead of people.

Extreme Ownership. We take full responsibility for outcomes, relentlessly driving toward solutions.

Engineer Out Requirements, then Automate. We simplify, optimize, and then automate for scale.

Share Your Legos. We collaborate openly, share knowledge, and empower each other to build bigger, better solutions.